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Commitments and guarantee (Details 1) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Guarantee $ 1,301 $ 1,184
Restricted cash
Liability
Associatesa And Joint Ventures [Member]    
IfrsStatementLineItems [Line Items]    
Guarantee 210 274
Restricted cash
Liability
Assets Retirement Obligations [Member]    
IfrsStatementLineItems [Line Items]    
Guarantee 1,091 910
Restricted cash
Liability